Vastolorde is the next step in the menos evolution coming after adjuchas.
Adjuchas is quite noticable by animal-esque features or just weird semi-large creatures in general. Vasto is defined by humansized bodies, it's theorized their standing upright, like the espada, with their masks still on. Wonderwyce here, stands upright, and hardly looks adjuchas here.
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When hollows become arrancar, the chances of them retaining a humanoid form increase with their intelligence; only vasto lorde-class arrancar will definitely assume a humanoid form.
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Bringing his intelligence into play, we've all seen the lack of it. How is it, he still retains his humanoid form, after being birthed so long ago?
My third point would be the invasion, timing, and conditioning of the hogyoku.
As we know the espada was complete apon Wonderwyces shinigamification. Halibel even attended this ritual. So the top espada were complete and yet Aizen was turning a human shaped hollow into an arrancar for what reason? His espada is complete he's invading Karakura town shortly, and the hogyoku is breaking down from overuse. Wonderwyce is noones fraccion, and is clearly too powerful to be a numerous. Aizen would no waste his time at this point making another adjuchas arrancar imo, hense WW is Vasto.